Molds & Tooling
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LDPE First Article Verification
Problem Phenomenon
After material change and mold change, dimensional and thickness problems appear in batches, and the first article is only checked for appearance
Cause Analysis
LDPE shrinkage varies with grade density; shrinkage behavior changes after material change; after film material change, both thickness and film bubble stability need to be reconfirmed; when troubleshooting on site, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
① First article for '2079851475616104452 performs appearance and dimension verification; ② first article for blown film measures thickness distribution and film bubble stability; ③ mass production after parameters are locked; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
LDPE first article is customized by process type; '2079851475616104452 checks dimensions, blown film checks thickness, and targeted verification prevents batch accidents; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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